//
//  XHZVisitorView.swift
//  Weibo
//
//  Created by 许惠占 on 2017/7/27.
//  Copyright © 2017年 许惠占. All rights reserved.
//

import UIKit

/// 访客视图
class XHZVisitorView: UIView {

    /// 访客视图的信息字典 [imageName / message]
    /// 提示： 如果是首页 imageName == ""
    var visitorInfo: [String: String]? {
        didSet {
            // 1> 取字典信息
            guard let imageName = visitorInfo?["imageName"], let message = visitorInfo?["message"] else {
                return
            }
            
            // 2> 设置消息
            tipLabel.text = message
            
            // 3> 设置图像，首页不需要设置
            if imageName == "" {
                startAnimation()
                return
            }
            
            iconView.image = UIImage(named: imageName)

            // 其他控制器的访客视图不需要显示小房子/遮罩视图
            houseIconView.isHidden = true
            maskIconView.isHidden = true
        }
    }
    
    // MARK: - 构造函数
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        setupUI()
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    /// 旋转图标动画 (首页)
    private func startAnimation() {
        
        let anim = CABasicAnimation(keyPath: "transform.rotation")
        
        anim.toValue = 2 * M_PI
        anim.repeatCount = MAXFLOAT
        anim.duration = 15
        
        // 动画完成不删除，如果 iconView 被释放，动画会一起销毁
        anim.isRemovedOnCompletion = false
        
        // 将动画添加到图层
        iconView.layer.add(anim, forKey: nil)
    }

    // MARK: - 私有控件
    /// 懒加载属性只有调用 UIKit 控件的指定构造函数，其他都需要使用类型
    /// 图像视图
    fileprivate lazy var iconView: UIImageView = UIImageView(image: UIImage(named: "visitordiscover_feed_image_smallicon"))
    
    /// 遮罩图像
    fileprivate lazy var maskIconView: UIImageView = UIImageView(image: UIImage(named: "visitordiscover_feed_mask_smallicon"))

    
    /// 小房子
    fileprivate lazy var houseIconView: UIImageView = UIImageView(image: UIImage(named: "visitordiscover_feed_image_house"))
    
    /// 提示标签
    fileprivate lazy var tipLabel: UILabel = UILabel.cz_label(withText: "关注一些人，回这里看看有什么惊喜关注一些人，回这里看看有什么惊喜",
                                                          fontSize: 14,
                                                          color: UIColor.darkGray)
    
    /// 注册按钮
    fileprivate lazy var registerButton: UIButton = UIButton.cz_textButton("注册",
                                                                       fontSize: 16, normalColor: UIColor.orange,
                                                                       highlightedColor: UIColor.black,
                                                                       backgroundImageName: "common_button_white_disable")
    /// 登录按钮
    fileprivate lazy var loginButton: UIButton = UIButton.cz_textButton("登录",
                                                                       fontSize: 16, normalColor: UIColor.darkGray,
                                                                       highlightedColor: UIColor.black,
                                                                       backgroundImageName: "common_button_white_disable")
}

// MARK: - 设置界面
extension XHZVisitorView {
    func setupUI() {
        backgroundColor = UIColor.cz_color(withHex: 0xEDEDED)
        
        // 1.添加控件
        addSubview(iconView)
        addSubview(maskIconView)
        addSubview(houseIconView)
        addSubview(tipLabel)
        addSubview(registerButton)
        addSubview(loginButton)
        
        // 文本居中
        tipLabel.textAlignment = .center
        
        // 2.取消 autoresizing
        for v in subviews {
            v.translatesAutoresizingMaskIntoConstraints = false
        }
        
        /**
         自动布局核心公式：
         view1.attr1 = view2.attr2 * multiplier + constant
         NSLayoutConstraint(item: iconView,     视图
                         attribute: .centerX,   约束属性
                         relatedBy: .equal,     约束关系
                         toItem: self,          参照视图
                         attribute: .centerX,   参数属性
                         multiplier: 1.0,       乘积
                         constant: 0))          约束数值
         
         如果指定 宽 高 约束
            > 参照视图设置为 nil
            > 参照属性选择 .notAnAttribute
         
         
                 */
        
        
        // 3.自动布局
        // 1> 图像视图
        addConstraint(NSLayoutConstraint(item: iconView,
                                         attribute: .centerX,
                                         relatedBy: .equal,
                                         toItem: self,
                                         attribute: .centerX,
                                         multiplier: 1.0,
                                         constant: 0))
        addConstraint(NSLayoutConstraint(item: iconView,
                                         attribute: .centerY,
                                         relatedBy: .equal,
                                         toItem: self,
                                         attribute: .centerY,
                                         multiplier: 1.0,
                                         constant: -60))
        
        // 2> 小房子
        addConstraint(NSLayoutConstraint(item: houseIconView,
                                         attribute: .centerX,
                                         relatedBy: .equal,
                                         toItem: iconView,
                                         attribute: .centerX,
                                         multiplier: 1.0,
                                         constant: 0))
        addConstraint(NSLayoutConstraint(item: houseIconView,
                                         attribute: .centerY,
                                         relatedBy: .equal,
                                         toItem: iconView,
                                         attribute: .centerY,
                                         multiplier: 1.0,
                                         constant: 0))
        
        // 3> 提示标签
        addConstraint(NSLayoutConstraint(item: tipLabel,
                                         attribute: .centerX,
                                         relatedBy: .equal,
                                         toItem: self,
                                         attribute: .centerX,
                                         multiplier: 1.0,
                                         constant: 0))
        addConstraint(NSLayoutConstraint(item: tipLabel,
                                         attribute: .top,
                                         relatedBy: .equal,
                                         toItem: iconView,
                                         attribute: .bottom,
                                         multiplier: 1.0,
                                         constant: 20))
        
        addConstraint(NSLayoutConstraint(item: tipLabel,
                                         attribute: .width,
                                         relatedBy: .equal,
                                         toItem: nil,
                                         attribute: .notAnAttribute,
                                         multiplier: 1.0,
                                         constant: 236))
        
        // 4> 注册按钮
        addConstraint(NSLayoutConstraint(item: registerButton,
                                         attribute: .left,
                                         relatedBy: .equal,
                                         toItem: tipLabel,
                                         attribute: .left,
                                         multiplier: 1.0,
                                         constant: 0))
        addConstraint(NSLayoutConstraint(item: registerButton,
                                         attribute: .top,
                                         relatedBy: .equal,
                                         toItem: tipLabel,
                                         attribute: .bottom,
                                         multiplier: 1.0,
                                         constant: 20))
        addConstraint(NSLayoutConstraint(item: registerButton,
                                         attribute: .width,
                                         relatedBy: .equal,
                                         toItem: nil,
                                         attribute: .notAnAttribute,
                                         multiplier: 1.0,
                                         constant: 100))
        
        // 5> 登录按钮
        addConstraint(NSLayoutConstraint(item: loginButton,
                                         attribute: .right,
                                         relatedBy: .equal,
                                         toItem: tipLabel,
                                         attribute: .right,
                                         multiplier: 1.0,
                                         constant: 0))
        addConstraint(NSLayoutConstraint(item: loginButton,
                                         attribute: .top,
                                         relatedBy: .equal,
                                         toItem: tipLabel,
                                         attribute: .bottom,
                                         multiplier: 1.0,
                                         constant: 20))
        addConstraint(NSLayoutConstraint(item: loginButton,
                                         attribute: .width,
                                         relatedBy: .equal,
                                         toItem: registerButton,
                                         attribute: .width,
                                         multiplier: 1.0,
                                         constant: 0))

        
        /**
         NSLayoutConstraint.constraintsWithVisualFormat(V|F公式，
         options: [],
         metrics: 约束数值字典 [String: 数值],
         views: 视图字典 [String: 子视图])
         
         VFL 可视化格式语言
         > H 水平方向
         > v 垂直方向
         > | 边界
         > [] 包含控件的名称字符串，对应关系在 views 字典中定义
         > () 定义空间的宽/高，可以在metrics 中指定

         */
        
        // 6> 遮罩视图
        // views: 定义 VFL 中的控件名称和实际名称映射关系
        let viewDict = ["maskIconView": maskIconView,
                        "registerButton": registerButton] as [String : Any]
        let metrics = ["spacing": -35]
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-0-[maskIconView]-0-|",
                                                      options: [], metrics: nil,
                                                      views: viewDict))
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-0-[maskIconView]-(spacing)-[registerButton]",
                                                      options: [], metrics: metrics,
                                                      views: viewDict))




    }
}
